Radiomovie lantern slide



Feb. 28, 1933. c, JENKINS- runpxouxovn:- LANTERN suns Filed Jan. 29. 1931 object large receiving-screen projection from a lantern. slide, the density of the latter of I v lighting of the slide, at the bubble location. These bubbles are formed at the elementary Patented Feb; v2s; 1933i PATENT;

CHARLES FRANCIS JENKINS,I or WASHINGTON, DISTRICT or COLUM IA, AssIGnoR. T0

c. FRANCIS JENKINsiNc, or WASHINGTOILDIST'RICT or COLUMBIA, A. conrona:

TIO'NOFTHE DISTRIG'L OF COLUMBIA RADIOMOVIE. LANTERN SIIQIDE Applicationfiled January 29,1931, Serial 512,181.":

This invention relates to radiomovies and television recelvers, and has for 1ts principal which can be changed by incoming radio signals in elementaryareas of the whole lantern slide surface. s I

' Basically the new concept may 1 consist of a liquid lantern slide, horizontally located, in which bubbles are formed to change the I areapoints of the picture area to build up contact brush lying at the end of each of o 48 radial wiresof the scanningdisc.

In the figures'A is a' lantern slide; B'the" a figure, projected ona screen. As the bub-V lbles rise andburst at the surface, new bubbles are formed, and in new places, and the figure formed thereby changes ;'namely, a new type of motion picture. I f t The bubbles formed in the fluid lantern slide represent the changing figure or scene at the radio broadcast station.

Again if this lantern slide can be locate in the projector beam of a powerful light source, obviously any size receiving screencan be brightly illuminated. f

These elementary area bubble points preferably lie in 48 rows of 48 bubble points each, namely, 2304 elementary points in the whole lantern slide, a standard adopted by the Radio Manufacturers Association. The bubble point locationsare determined by tin wires fixed in the lantern slide.

With these and other objects in view the invention consists of the novel combination of elements hereinafter described, illustrated I in the drawing, and pointed out ,in the I g V bubble at the submerged wire which is at the momenta part of theci'rcuit, This bubble "soon reachesa sizejwhere it breaks. loose'and' sectional view' of the slide Fig. 4 a reduced. drawing of thelantern slide and its scan-' ning disc in operative relation and'Fig. 5 the transparent'scanningdisc; C theosource of light; 1) condenser lenses for concentrating the light through the lantern slide by reflection from the mirror E; and onto the screen F; and through the. lens G. v

" The lantern slide is made up of a tray A,

the

( not shown) reflect-ed from the second mirror of lead, for example, with atransparent bottom therein, A, Fig. 3.1This transparent bottom is studded with tiny wires, locatedin rows, with an equal number ofwires in each row, andthese wires are submerged in an acidulated solution, A".

The scanning disc, B,'has radi'allylocated wires, B2, B2, B2, .leading from the segments of a commutator, B3,'at thehub. There are as many such radialwires as there are rows of 'wire points in the lantern slide. The

outer end of each wire on the scanning disc.

is tipped with acontact brush, B4, shown in Fig. 5. These brushes'are spirally located, that is, each is ata shorter radial distance from "the hub' than the preceding one; and these radialdifferences are equal to the separation of the rows of tiny contact wires in the lantern slide.

Assuming the scanning disc to be put into rotation, with the brush, B4, making contact with the successive wires. of the several rows of them in the bottom of the lantern slide,

the complete electric circuit would then contain 1);a wire fromthe radio amplifier to the commutator, the commutator, a

radial wire of the scanning disc, (4) a ter-" minal wire in the bottom of the lantern slide,

(5) theacidulated solution, (6) the lead mar gin of the lantern slide, and" (7) the wire amplifier) a Current flowing in. th IS CIICUlt creates a leading back tothe other terminal of the rises to the top' of the solution and bursts.

During this whole time-lthelight passing through the bubble so, efifectsthe projected light from the source Cthat it is imaged on the screen, for example, as a lighterspot than the surrounding fluid if the latter is colored.

If,therefore, the scanning disc'is put into As the current from the amplifier of the radio set to the scanning disc is intermittent, an intermittency determined by the incoming radio signals, it will be seen that the bubbles will occur intermittently and at different places on the surface of the liquid lanternslide.

If the scanning disc is in synchronism with the analytical mechanism at the broadcast station, then these succession of bubbles will form an image of the person, object or scene at the broadcast station.

With the scanning disc rotation 900 R. P. M., that is, for a new picture every fifteenth of a second, the contact time for each Wire is about one-thirty-five thousandth of a second. I r

The depth of the liquid determines the time the bubblepersists, and, of course, is controllable. fine-tenth of a second persistence has been found to produce quite sharp motion pictures.

The contact time between scanning disc brush and lantern slide wires being constant, the size of voltage applied, a small bubble for low voltages, and a large bubble for higher voltages. Therefore as the halftones at the transmitting station gives but half voltage values,

these lower Voltages at the receiving station produce halftone values-in the received bubble picture.

The process rather closely follows the principle of the halftone printing block used in newspaper illustrations. As the groups of small dots representing the halftone areas and groups of the larger dots the darker portions, so in these lantern-slides, the size of the bubbles in different groups determines the contrasts in the picture.

It has been found that physical contact between the scanning disc brushes and the studs in the lantern slide is not necessary to produce the results sought. If the brush passes Within sparking distance of the stud, bubbles will be-formed and produce just as satisfac 'tory a picture as if actual physical contact were made instead of spark contact.

What I claim, iso In apparatus of the class described, a source of light, a liquid lantern slide through which light from said source maypass, a transparent scanning disc in operative relation to said lantern slide, and means carried by said scanning disc whereby bubbles may be formed in said liquid lanternslide. V

In testimony whereof I. have afiixed my signature. 7

CHARLES runners JENKINS.

the bubble will depend on the 

